الفهرس 
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Abstract
Cervicogenic dizziness is a disabling condition characterized by dizziness arises from the cervical spine mainly rather than true spinning or rotational vertigo.
Cervicogenic dizziness has multifactorial mechanisms and probable pathophysiology. So, in this study we examined two groups of patients with cervical spine spondylo-degenerative changes with and without dizziness to deduce the possible mechanisms causing CGD.
One of these mechanisms is the vascular compression mechanism “vertebro-basilar insufficiency, VBI ” which was supported by the results of OAEs and VAT in which decrease blood flow to vestibular labyrinth resulting in dizziness and imbalance.
Other probable mechanism is the affection of the vestibulo-collic reflex (VCR) and nerve compression.This might be explained by the abnormal C-VEMPs results which may be due to the compression of descending vestibulo-spinal tract supporting the theory of nerve compression.
Instability and postural disorders may be detected in patients with spondylo-degenerative disorders even though the normal results of the vestibular tests which may be explained by functional or structural damage to neck proprioceptive receptors which is another probable mechanism for CGD. This may justify the abnormal findings of SOT scores in patients with spondylo-degenerative disorders complaining of dizziness rather than the other group of patients with no-dizziness.